Year	Number
2004-01-01	9.7562
2005-01-01	13.1894
2006-01-01	13.2610
2007-01-01	15.9807
2008-01-01	19.7173
2009-01-01	20.2437
2010-01-01	20.4570
2011-01-01	21.1019
2012-01-01	21.4521
2013-01-01	24.0448
2014-01-01	33.7114
2015-01-01	31.1567
2016-01-01	28.8129
2017-01-01	43.6439